Using Ceph central backup storage - Best practice creating pools

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Hi,
 
my use case for Ceph is serving a central backup storage.
This means I will backup multiple databases in Ceph storage cluster.
 
This is my question:
What is the best practice for creating pools & images?
Should I create multiple pools, means one pool per database?
Or should I create a single pool "backup" and use namespace when writing
data in the pool?
 
This is the security demand that should be considered:
DB-owner A can only modify the files that belong to A; other files
(owned by B, C or D) are accessible for A.

And there's another issue:
How can I identify a backup created by client A that I want to restore
on another client Z?
I mean typically client A would write a backup file identified by the
filename.
Would it be possible on client Z to identify this backup file by
filename? If yes, how?
 
 
THX
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